Process for producing a hard low-temperature coke



Patented Apr. 10, 1928.

UNITED STATES KURT J'AHNKE, OF LUDWIGSBURG, GERMANY.

PROCESS FOR PRODUCING A HARD LOW-TEMPERATURE COKE.

No Drawing. Application filed October 19, 1926, Serial No. 142,774, andin Germany May 2, 1924.

The half-coke heretofore technically produced can only find industrialuse when made into briquets or when utilized in a coal dust furnacesince, due to its brittle and fragile characteristics, it is practicallyimpossible to transport it or to move it, even though the distance issmall. These disadvantages have been overcome by means of the followingprocess.

The crushed and pulverized spongy iron ore, as for instance,crystallized ferrocarbo-nate, FeCQ which can be used as it is mined orit can be produced chemically, is mixed with abituminous material suchas 5 tar, coal tar, brown coal tar, etc. Instead of the ferrocarbonate,other compounds can also be used which will easily react at lowcokingtemperatures and instead of the tar, also pitch of the compoundsmentioned can be used as well as colophony or similar substances" whichwill yield a residue during distillation.

This mixture is then introduced into the pulverized fuel after which anintimate and homogeneous mixing of the materials is effected. Thereafterthe fuel together with the admixed substances is subjected to the usuallow temperature dry carbonization process wherein a temperature ofapproximately 500 C. is utilized and the necessary carbonization time.of approximately 12 to 18 hours is adhered to.

The addition of FeCO and tar, as specified, varies, depending upon thespecific fuel used. the amount of ferrocarbonate varying between 1% toand tar between 1% to 10% by weight of the fuel.

The sphere of use of the coke produced by this process can be extendedto include a l industries and particularly n'ietallurgical industries,since the coke is hardened to such an extent, that it withstands thepressure of the blast furnace and is more easily c6111- bustible, andfurthermore, the added substances do not interfere.

The added substances admixed with the fuel are all equally essential,that is, the ferrocarbonate is as essential as the tar, since it hasbeen proven by experiments that the ferrocarbonate acts as a hardeningagent and the tar as a binding agent.

Coal is the specific fuel used and by that term is included anthracite,bituminous and lignite coals.

I claim as my invention:

1. A process for producing hard low temperature coke which comprises thesteps of mixinga pulverized coal with a mixture of pulverizedferrocarbonate and a bituminous material; and subjecting this mixture tolow temperature carbonization.

2. A process for producing hard low temperature coke which consists inthe steps of mixing ferrocarbonat with tar; mixing this mixture with apulv rized coal; and sub- 05 jectingthe second mixture to lowtemperature carbonization.

3. A process for producing hard low temperature coke which comprises theSteps of mixing a pulverized coal with a mixture of To pulverizedferrocarbonate and a substance which will yield a residue upondistillation; and subjecting this mixture to low temperaturecarbonization.

A process for producing hard low temis .pcrature coke which comprisesthe steps of mixing a pulverized coal with a mixture of pulverizedcrystallized ferrocarbonate and coal tar; and subjecting this mixture tolow temperature carbonization.

In testimony whereof I affix my signature.

KURTJAHNKE.

